Device for copying on machine tools



Dec. 10, 1929. F. STEIN I 1,739,268

DEVICE FOR COPYING ONMACHINE TOOLS Filed Jan. 2'7, 1928 t; TTQR HEY;

Patented Dec. 10, 1929 UNITED STATES PATENT OFFIOE] FRIEDRICH STEIN, OI HEIDENEEIM-ON-THE-BRENZ, GERMANY, ASSIGNOR T J. I. V'OI'JlH, OI HEIDENm-ON-THE-BBENZ, GERMANY, A CORPORATION OF GERMANY DEVICE FOR COPYING ON MACHINE TOOLS R S S U Application med January 27, 1923, Serial No. 248,867, and in Germany January 29, 1927.

This invention relates to improvements in reproducing mechanism; especially apparatus for making objects according to a design or pattern of especial shape.

'An ob ect of the invention is to provide a mechanical reproducing device which is simple in construction, accurate in operation, and designed to reduce the wear on the important parts.

With reproducing apparatus now in use, the enlargement and reduction of the pattern can be obtained only to a restricted extent; hence for each particular size desired, a different pattern has to .be employed. Also the pattern is subjected to considerable pressure, and must therefore be made of the best material; and even then its accuracy soon becomes impaired.

It'has been further proposed to operate rior reducing devices by electric motors, ut with apparatus of this description the speed is'necessarily slow and no variation from the dimensions of the pattern is allowed. 25 With my invention all of these disadvantages are eliminated, without requiring a very complicated machine.-

A practical embodiment of my invention is of such a character that the form of the pattern or template is transmitted to the blank or work piece not directly but through the instrumentality of a fluid motor, which generates the principal forces required for operation; the forces exerted on the pattern being relatively small and utilized purely for purposes of control and regulation. Further, enlar ement or reduction of the pattern can easlly be obtained and diflerent sizes can be produced by the use of patterns having only one size. Various sizes can thus be made from the same pattern, and as the forces to which the patterns are subjected are small the pattern does not need to be made of. the best material. Even when made of inferior materials the patterns do not wear to any marked extent and theliability to impairment of outline is obviated. Likewise large and heavy parts for the transmission of motion and governing the device are rendered unnecessary.

-My invention further comprises the design of a fluid motor which is so built that it can be very easily actuated and controlled by the movement of the pattern, the form of whlch is bein impressed upon the blank or work piece y the cutting tool of the reproducin mechanism.

The ot er objects and advantages of the invention are set forth in the following description and the novel features are pointed out in the appended claims. The disclosure, however, is illustrative only and I can yary the structural details without departing from the principle of the invention or exceeding the scope or the terms in which the claims arev expressed.

On the drawings,-

Figure 1 shows diagrammatically one construction containing my invention; and

Fig. 2 presents a modification.

The pattern is shown at a and it has the form of a cam or disk mounted to rotate upon a shaft a at k, the work piece or blank being mounted to rotate on a shaft 7 k which turns at the same speed as the shaft a. The blank is engaged by a cutting tool .z' so actuated and controlled that the outline of the pattern a is reproduced upon the blank is. Forthis purpose the tool '5 is mounted upon a rod 72. carried by a piston h in a cylinder 9 through which working fluid is admitted by way of passages e and 7 communicating with the opposite ends of the cylinder 9. These passages lead to the easing 0 of the valve '0, which has the form of a double piston valve bearing two heads.

These heads are spaced apart a distance equal to that between the ends of the passages e and f, and in the position of the valve '2) shown in Fig. 1, thevalve closes the two passages e and From the valve (1 projects a rod 6 and om the piston h projects a rod 9. These two rods '0 and 1- are pivotally connected to a lever l, the rod 1- being joined to one end of the lever Z and the rod b being joined to the lever Z at Z, intermediate its ends. The opposite end of this lever is connected by a link 1 to a lever m pivoted at m, the end of the lever on remote from the link n bearing against the periphery of the pattern a. At al is a supply pipe to lead fluid to the casing c of the valve '0. In operation, if the pattern a is rotating counter-clockwise, when the pattern a and work piece are in rotation the pattern moves the lever m to actuate the level Z and moves the valve '0 so that fluid is admitted to the cylinder 9 on one side or the other of piston h to actuate the cutting tool i accordingly. If desired, a spring may be employed to engage the lever m in such a way as to make the end of this lever, shown as the lower end in Fig. 1, press constantly against the outline of the pattern a. Suppose for example that this pattern is rotating counter-clockwise. If then a point on its periphery of less distance from the center or axis of rotation comes into contact with the end of the lever m, the said end of the lever m will tend to move closer to the axis of rotation of the shaft a. This movement of the lever m will pull the link at to draw out the rod I), thus causing the valve '2) toopen the passage f and let fluid flow into the right hand end of the cylinder 9; at the same time uncovering the passage e to the exhaust. Hence the tool-2' is forced with greater pressure against the work-piece 7a to cut it away closer to the axis ofvk'. As the successive radii of the pattern a increase, the level Z is moved in thereverse direction to cause movement of the valve to open the passage to the exhaust and admit fluid through the passage 0 to the opposite side of the piston h; thusthe tool 2' is withdrawn and the portions of larger radius of the pattern are thus reproduced upon the blank Consequently as the operation of the reproducing mechanism proceeds, the ma or forces are exerted upon the tool 71 only, and

the forces'which are transmitted by the pattern a to the levers are only sufficient to aflect the inlet and exhaust of the fluid to the. motor. The wear on the pattern is thus slight. Further, by the proper design of levers, any size desired can be obtained for the work piece in without changing the size of the pattern (1.

Suppose the pattern (1 turns from right to left with reference to Fig. 1. The first movement of the lever on will pull the rod 7) out to the right to make the valve '0 expose the passage '7, the'lever Z moving around its end connected to the rod 7' at this time as a fulcrum. As soon, however, as the piston it begins to" move it tends to swing this lever Z around its lower end as a fulcrum and in thereverse direction with the effect of partly closing the passage Thus the piston h presses the tool 71 so as to project it against the work piece k only as far as necessary and this tool thus actually reproduces the outline of the pattern a. Further as the attern a brings increasing radii to bear against the end of the lever'mso as to move the valve '2: in the opposite direction, the lever Z first moves to the left around, its upper end as an axis to carry the valve 6 to the left, and as soon as fluid begins to flow through the passage e to carry the piston h to the right the rod 7' causes movement of the lever Z around its lower end as a pivot to return the valve 1: and cut down the amount of fluid entering by way of passage 6; thus the reciprocations of the piston h are effectually regulated.

In Fig. 2 the piston rod h'carries a collar 0 which is fixed thereon, and surrounding the rod'h between the collar 0 and the tool 2' isa collar n, which has an opening for an antifriction element p which bears against the collar 0. The collar 12 is rigid with one end of the lever Z pivotally connected at Z to the rod 6 of the valve in the casing c and b is a link which slides in a bearing 8 and is connected to the lower end of the lever Z. This construction operates in the same manner as the one described above to reciprocate the piston h. The collar n has a radial slot therein for the roll p, and the position of the roll 1) can be changed in the slot by moving it towards or from the axis of the rod h. Hence the distance between the point Z of the lever Z and the point where the'roll p engages the collar a. indicated by the distance 0' in Fig. 2, can be changed so as to regulate the size of reproduction at the work piece 70; 1

Claims: p

1. A reproducing device, comprising a movable pattern and a movable work piece whereon the pattern is to be reproduced, and means under the command of the pattern for operating upon the work piece, comprising a tool, a fluid motor commanding the tool, and valve means controlling the operation of the motor connected to be controlled by the movement of the pattern.

2. A reproducing device, comprising a movablework piece and a movable pattern, a tool to engage the work piece, a fluid motor to control the movement of the tool, and connections comprising levers oneof which engages the pattern for controlling the motor to cause the tool to reproduce the pattern on the work piece.

3. A device according to claim 1, wherein the connections between the pattern and the parts of the fluid motor are adjustable to vary the size of the pattern reproduced by the too 4. A device according to claim 2, wherein the efiectivelength of part of the levers can be changed to vary the dimensions of the pattern impressed upon the work piece.

the piston and to one end of said lever, a rod connected to the valve and to the lever between its ends, and a second lever mounted to engage the pattern at one end and having its opposite end connected to the other end of the first named lever.

6. A reproducing device, comprising a movable pattern and a movable work piece, a tool, a piston having a rod carrying the tool, a cylinder containing the piston, a motor havingpassages to admit fluid to the opposite sides of the piston, a valve casing connected to said passages, the piston having a collar fixed thereon, a collar surrounding the piston rod between the said collar and the tool, said last named collar having a slot containing an adjustable roller, a lever attached to the lastnamed collar, a rod projecting from the valve casing and pivotally connected to the lever between its ends, and a sliding link connected to the lever at its end remote from said piston rod, the link being arranged to bear upon the circumference of the pattern.

' In testimony whereof I afix my signature.

FRIEDRICH STEIN.

DISCLAHMER 1,739,268.Friedrich Stein, Heidenheim-on-the-Brenz, Germany. DEVICE FOR A Disclaimer filed July 19, 1933, by the, assignee and the patentee, J. M. Voith, and Friedrich COPYING ON MACHINE TOOLS. Patent dated December 10, 1929.

Stein.

Hereby enter this disclaimer to that part of the claim in said specification which is in the following Words, to Wit:

1. A reproducing device, comprising a movable pattern and a movable work piece whereon thepattern is to be reproduced, and means under the command of the pattern for operating upon the work piece, comprising a tool, a fiuid motor commandring-the tool, and valve means controlling the operation of the motor connected to be controlled by the movement of the pattern.

2. A. reproducing device, comprising a movable work piece and a movable pattern, a tool-to engage the Work piece, a fluid motor to control the movement of the tool, and connections comprising levers one of which engages the pattern for controlling the motor to cause the tool to reproduce the pattern on the Work piece.

V [Ofiicial Gazette August 15, 1988.] 

